Mineralogy Database

Fougerite Mineral Data

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General Fougerite Information

Help on Chemical  Formula: Chemical Formula: (Fe++,Mg)6Fe+++2(OH)18•4(H2O)
Help on Composition: Composition: Molecular Weight = 777.66 gm
   Magnesium   4.69 %  Mg    7.77 % MgO
   Iron       46.68 %  Fe   41.57 % FeO / 20.54 % Fe2O3
   Hydrogen    3.37 %  H    30.12 % H2O
   Oxygen     45.26 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Fe2+4.5Mg1.5Fe3+2(OH)18•4(H2O)
Help on Environment: Environment: Poorly drained soils ensuring reducing conditions. Meixnerite group.
Help on IMA Status: IMA Status: Proposed IMA 2003 (Dana # Added)
Help on Locality: Locality: Discovered coloring (green) the soil of the Foug�res Forest in the Ille-et-Vilaine region of France Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the locality.
Help on Synonym: Synonym: Green Rust

Fougerite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:7.19999
Help on Cell Dimensions: Cell Dimensions: a = 3.125, c = 22.5, Z = 0.375; V = 190.29 Den(Calc)= 2.54
Help on Crystal System: Crystal System: Trigonal - Hexagonal Scalenohedral H-M Symbol (3 2/m) Space Group: R 3m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 7.97(1), 2.692(0.34), 3.97(0.32),2.027(0.19), 1.563(0.1), 1.595(0.09),

Physical Properties of Fougerite

Help on Color: Color: Bluish gray.
Help on Luster: Luster: Earthy (Dull)

Optical Properties of Fougerite

Help on Optical Data: Optical Data: Uniaxial (?).
  NCalc= 1.66 - from Gladstone-Dale relationship (KC = 0.2608) where Ncalc=Dcalc*KC+1

Calculated Properties of Fougerite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.54 gm/cc
note: Specific Gravity of Fougerite =2.54 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEFougerite = 13.77 barns/electron
U=PEFougerite x rElectron Density= 35.00 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Fougerite is Not Radioactive

Fougerite Classification

Help on  Dana Class: Dana Class: (06)Hydroxides and Oxides Containing Hydroxyl
  (06.04)containing multiple cations
  (06.04.06)Dana Group Meixnerite Mg6Al2(OH)18•4(H2O) R 3m 3 2/m Fougerite! (Fe,Mg)6Fe2(OH)18•4(H2O) R 3m 3 2/m
Help on  Strunz Class: Strunz Class: 04.FE.05 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate
  04.F - Hydroxides (without V or U)
  04.FE -Hydroxides with OH, without H2O; sheets of edge-sharing octahedra
04.FE.05 Amakinite (Fe,Mg)(OH)2 P 3m1 3 2/m
04.FE.05 Brucite Mg(OH)2 P 3m1 3 2/m
04.FE.05 Portlandite Ca(OH)2 P 3m1 3 2/m
04.FE.05 Pyrochroite Mn(OH)2 P 3m1 3 2/m
04.FE.05 Theophrastite Ni(OH)2 P 3m1 3 2/m
04.FE.05 Fougerite! (Fe,Mg)6Fe2(OH)18•4(H2O) R 3m 3 2/m

Other Fougerite Information

Help on See Also: See Also: Links to other databases for Fougerite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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Dana No: Strunz No: 04.FE.05





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